2010-02-15 - Response of Equilibira

2010-02-15 - Response of Equilibira - Compressing a...

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CHEMICAL EQUILIBRIA: Ch 6 – Le Chatelier’s Principle References: - Chemical Principles, Steven S. Zumdahl, Fifth Edition, Houghton Mifflin Custom Publishing, Boston, MA - Professor Paul Mc Cord Notes, CH 302, University of Texas at Austin 1 The Response of Equilibria to Changes in Conditions Le Chatelier’s principle: When a stress is applied to a system in equilibrium, the equilibirum tends to adjust to minimize the effect of the stress
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Adding and Removing Reagents : We can explain the responses by considering the relative sizes of Q and K Reactant: i) added to a reaction mixture, the reaction tends to form products; ii) removed from a reaction mixture, more reactants form. Products: i) added, the reaction tends to form reactants; ii) removed, more product is formed
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Unformatted text preview: Compressing a Reaction Mixture : Compression of a reaction mixture tends to drive the reaction in the direction that Reduces the number of gas molecules (reducing the pressure). Increasing the pressure by introducing an inert gas has no effect on the equilibrium composition. Temperature and Equilibrium: Raising the temperature of an exothermic reaction favors the formation of reactants; raising the temperature of an endothermic reaction favors the formation of products. K RT G o ln 2 1 1 2 1 1 ln T T R H K K o Van’t Hoff Equation Catalysts: Increases the rate of a chemical reaction without being consumed itself. It has no effect on the equilibrium composition of a reaction mixture...
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This note was uploaded on 03/06/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.

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2010-02-15 - Response of Equilibira - Compressing a...

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